package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.lang.reflect.Member;
import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品
     * @param dishDTO
     */
    @Override
    @Transactional//事务注解，该方法为原子性
    public void saveWithFlavor(DishDTO dishDTO) {
        //向菜品表加入一条数据
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        dishMapper.insert(dish);
        //获取INSERT语句生成的主键值
        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null&& flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuert(DishPageQueryDTO dishPageQueryDTO) {
        //使用pageHelper开始分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        //调用查询方法，在mapper实现增删改查,返回类型必须是PageHelper包中的page
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 根据菜品id删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断菜品能否删除，菜品是否处于起售状态
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //菜品是否有关联套餐
        List<Long> setmealIdsByDishIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIdsByDishIds != null && setmealIdsByDishIds.size()>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //批量删除菜品
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //批量删除菜品口味
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //在mapper中foreach循环id，只需修改MYSQL语句,优化代码
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByIds(ids);
    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品
        Dish dish=dishMapper.getById(id);
        //根据id查询口味
        List<DishFlavor> flavor= dishFlavorMapper.getByDishId(id);
        //封装到一起
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavor);
        return dishVO;
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
       //因为DTO中包含口味信息，而目前只需操作基本信息，所以封装到dish中
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品基本信息
        dishMapper.update(dish);
        //删除原有口味数据
        dishFlavorMapper.getByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null&& flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);}
    }

    /**
     * 根据分类ID查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        //创建菜品对象并设置他的分类ID和状态，并返回
        Dish dish =Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        return dishMapper.list(dish);
    }

    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
